镍包覆碳化硅颗粒增强Al2519复合材料的制备和性能研究  

Prepare and Properties for Ni-coated SiC Particles Reinforced Al2519 Matrix Composites

作　　者：崔蕊 王日初[1] 彭超群[1] 董翠鸽 CUI Rui;WANG Ri-chu;PENG Chao-qun;DONG Cui-ge(School of Materials Science and Engineering, Central South University, Changsha 410083, China)

机构地区：[1]中南大学材料科学与工程学院

出　　处：《铝加工》2019年第3期14-18,共5页Aluminium Fabrication

摘　　要：采用化学镀方法在SiCp表面镀镍,然后采用真空热压法烧结出不同体积分数(5%~20%)的镀镍和未镀覆SiCp增强Al2519复合材料,之后对复合材料进行热挤压和热处理。SEM、XRD及布氏硬度计测试和拉伸试验结果表明,SiCp镀镍可提高SiCp与基体的润湿性,减少复合材料中的孔隙,提高致密度。与未镀覆SiCp相比,镀镍SiCp分散性变好,镍镀层与基体Al发生化学反应,生成稳定的新相Al3Ni。复合材料的力学性能得到很大提高,其硬度、抗拉强度和延伸率分别提高了15.6%~20%、5.5%~8.42%和9.45%~40.55%。Electroless nickel plating was used on the surface of SiCp, and then nickel-plated and uncoated SiCpreinforced Al2519 composites with different volume fractions(5%~ 20%) were sintered by vacuum hot-pressing method, and then the composites were subjected to hot extrusion and heat treatment. SEM, XRD brinell hardness test and tensile test results show that SiCpnickel plating can improve the wettability of SiCpand matrix, reduce the porosity of composite material and increase the density. Compared with the uncoated SiCp, the dispersion of nickel plating SiCpis better. The nickel coating reacts with the substrate Al to generate a stable and new phase Al3Ni. The mechanical properties of the composite material are greatly improved, and its hardness, tensile strength and elongation are increased by 15.6%~ 20%, 5.5%~ 8.42% and 9.45%~ 40.55%, respectively.

关 键 词：SiC_p/Al2519复合材料 化学镀镍 粉末冶金 力学性能 微观组织 

分 类 号：TG146.21[一般工业技术—材料科学与工程]